yaffs_mtdif2.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_mtdif.c  NAND mtd wrapper functions.
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 // mtd interface for YAFFS2
  17
  18 const char *yaffs_mtdif2_c_version = "$Id: yaffs_mtdif2.c,v 1.6 2005-08-01 20:52:35 luc Exp $";
  19
  20 #include "yportenv.h"
  21
  22 #ifdef CONFIG_YAFFS_YAFFS1
  23
  24 #include "yaffs_mtdif2.h"
  25
  26 #include "linux/mtd/mtd.h"
  27 #include "linux/types.h"
  28 #include "linux/time.h"
  29
  30 #include "yaffs_packedtags2.h"
  31
  32
  33
  34
  35 int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_ExtendedTags *tags)
  36 {
  37         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  38         size_t dummy;
  39         int retval = 0;
  40
  41
  42         loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
  43
  44         yaffs_PackedTags2 pt;
  45
  46         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p" TENDSTR),chunkInNAND,data,tags));
  47
  48         if(tags)
  49         {
  50                 yaffs_PackTags2(&pt,tags);
  51         }
  52
  53         if(data && tags)
  54         {
  55                 if(dev->useNANDECC)
  56                   retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
  57                 else
  58                   retval = mtd->write_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,(__u8 *)&pt,NULL);
  59         }
  60         else
  61         {
  62         if(data)
  63                 retval = mtd->write(mtd,addr,dev->nBytesPerChunk,&dummy,data);
  64         if(tags)
  65                 retval = mtd->write_oob(mtd,addr,mtd->oobsize,&dummy,(__u8 *)&pt);
  66
  67         }
  68
  69     if (retval == 0)
  70         return YAFFS_OK;
  71     else
  72         return YAFFS_FAIL;
  73 }
  74
  75 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags)
  76 {
  77         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
  78         size_t dummy;
  79         int retval = 0;
  80
  81
  82         loff_t addr = ((loff_t)chunkInNAND) * dev->nBytesPerChunk;
  83
  84         yaffs_PackedTags2 pt;
  85
  86         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_ReadChunkWithTagsToNAND chunk %d data %p tags %p" TENDSTR),chunkInNAND,data,tags));
  87
  88         if(data && tags)
  89         {
  90                 if(dev->useNANDECC)
  91                 {
  92                         retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);
  93                 }
  94                 else
  95                 {
  96                         retval = mtd->read_ecc(mtd,addr,dev->nBytesPerChunk,&dummy,data,dev->spareBuffer,NULL);
  97                 }
  98         }
  99         else
 100         {
 101         if(data)
 102                 retval = mtd->read(mtd,addr,dev->nBytesPerChunk,&dummy,data);
 103         if(tags)
 104                 retval = mtd->read_oob(mtd,addr,mtd->oobsize,&dummy,dev->spareBuffer);
 105         }
 106
 107     memcpy(&pt,dev->spareBuffer,sizeof(pt));
 108
 109     if(tags)
 110         yaffs_UnpackTags2(tags,&pt);
 111
 112     if (retval == 0)
 113         return YAFFS_OK;
 114     else
 115         return YAFFS_FAIL;
 116 }
 117
 118 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 119 {
 120         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 121         int retval;
 122         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR),blockNo));
 123
 124
 125         retval = mtd->block_markbad(mtd,blockNo * dev->nChunksPerBlock * dev->nBytesPerChunk);
 126
 127     if (retval == 0)
 128         return YAFFS_OK;
 129     else
 130         return YAFFS_FAIL;
 131
 132 }
 133
 134 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber)
 135 {
 136         struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
 137         int retval;
 138
 139         T(YAFFS_TRACE_MTD,(TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR),blockNo));
 140         retval = mtd->block_isbad(mtd,blockNo* dev->nChunksPerBlock * dev->nBytesPerChunk);
 141
 142         if(retval)
 143         {
 144                 T(YAFFS_TRACE_MTD,(TSTR("block is bad" TENDSTR)));
 145
 146                 *state = YAFFS_BLOCK_STATE_DEAD;
 147                 *sequenceNumber = 0;
 148         }
 149         else
 150         {
 151                 yaffs_ExtendedTags t;
 152                 nandmtd2_ReadChunkWithTagsFromNAND(dev,blockNo * dev->nChunksPerBlock,NULL, &t);
 153
 154                 if(t.chunkUsed)
 155                 {
 156                   *sequenceNumber = t.sequenceNumber;
 157                   *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
 158                 }
 159                 else
 160                 {
 161                   *sequenceNumber = 0;
 162                   *state = YAFFS_BLOCK_STATE_EMPTY;
 163                 }
 164         }
 165                 T(YAFFS_TRACE_MTD,(TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,*state));
 166
 167     if (retval == 0)
 168         return YAFFS_OK;
 169     else
 170         return YAFFS_FAIL;
 171 }
 172
 173 #endif
 174
 175
 176